<!-- 自动获取焦点 -->
<script src="./vue.js"></script>

<div id="app">
    <input type="text" v-focus="true">
</div>

<script>
    Vue.directive('focus', {

        inserted(el, binding) {
            if (binding.value) {
                el.focus()
            }
        }
    });
    var ve = new Vue({
        el: '#app',

    });
</script>